import java.util.Random;

public class TestGit {
    public static void main(String[] args) {
        String s1 = "asdf2s7sd5t7y85$@!@$" ;
        Random random = new Random();
        String b = "a"   ;
        for (int i = 0; i <4 ; i++) {
            char c = s1.charAt(random.nextInt(s1.length()));
             b += c+"" ;
        }

        System.out.println(b.substring(1));

    }
}
